The Unseen University (UU) is a school of wizardry in Terry Pratchett's Discworld series of fantasy novels. Located in the fictional city of Ankh-Morpork, the UU is staffed by mostly indolent and inept old wizards. The university's name is a pun on the Invisible College, and many aspects of the university are references to Oxford and Cambridge University. The exploits of the head wizards of the Unseen University are a major component in many of the story lines in the books, playing a central role in 13 novels of the main series, as well as the four supplementary The Science of Discworld books and the short story, A Collegiate Casting-Out of Devilish Devices.